Swing door inclosure interlock



March 14, 1933. JACOBSQN 1,901,517

SWING DOOR INCLOSURE INTERLOCK Q Filed June 13, 1929 3 Sheets-Sheet 1 March 14, G JACOBSON SWING DOOR INCLOSURE INTERLOCK Filed June 13, 1929 38heets-Sheet 2 Wain-$271111;

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' March 14, 1933. L. a. JACOBSON 1,901,517

SWING DOOR INCLOSURE INTERLOCK Filed June 15, 1929 3 Sheets-Sheet 3 Zlwvantoz L (la/W69 Glare 0650 u NE CAB CONTROL sw/ rc/l dttmm Patented Mar. '14, 1933 UNITED STATES LUDWIG G. JAGOBSON, OF JAMESTOWN,

NEW YORK, ASSIGNOR To 'nArrLstrnoM.

YORK

' SWING noon INCLOSUR-E m'rnnnocx Application filed June '13,

This invention relates to an improvement in door and doorinclosures and more particpilarly to an interlocking mechanism there or. 1 i

In its preferred embodiment this invention is directed to an automatically operated interlocking mechanism for swing doors mounted in elevator entrance inclosures. The interlockingstructure, although shown as applied to elevator entrance inclosures, is equally applicable to practically all types of swing door inclosures wherein it is desired to automatically engage or release a door atspecified times or under certain conditions. Although door 'inclosures now :on the market are provided with various: kinds of locking mechanisms and although these structures are in commercial operation, they are not wholly practical from the standpoint of safety, convenience of operation, size, location, and cost'of manufacture. In the present trend of elevator entrance inclosure structures, it is essential that doors opening upon the elevator shaft be provided with a locking be of such design andconstruction as to permit automatic control through the elevator cab. It is most vital in providing a structure of this type that the lock be positive and quick acting orin a sense foolproof in order to pass the inspection ofv the building underwriters. In producing locking mechanisms containing the above requirementsfit is also of great importance to so design the mechanism that it will not be cumbersome and present an unsightly appearance. Present elevator entrance inclosures, and particularly those of the swing door type, are the procluct of simple and attractive designs and it is therefore essential that the locking structure be absolutely concealed from view and further that when the door is in opened position no unsightly structure is discernible.

The principal object of this invention is toprovide a swing door entrance inclosure, the interlocking mechanism of which is both r positive and quick acting. V i Another object of this invention is to pro- 7 either the door or'inclosure.

structure which does not extend into. said: shaft but is contained within the inclosure.. Furthermore, it is essential that the devicegaged position;

1929. Serial No. 370,553,

containedwithin 'the'walls of the ,inclosure es and provided "with automatic mechanical contact with an elevator cab by. whi'chlto operate said interlock. i

A still further objectof anew eaten lies in. the provision .of an interlocking mechaR eo nism requiring nov unsightly openings in Another and further object of this invention' is the provision of an automatically operated draw bolt retaining means." v p 365 Other and further objects of this invention will be more readily understood from av consideration of the following 'sp'ecification when taken in conjunction with the ac compa'nying drawings; and in which 70 Fig. 1 is a View of an elevator shaft, show-, 7 ing the mechanical contact. between'theinterlocking mechanism ofa swing door inc'losure unit and an elevator cab; d

Fig. 2 is a fragmentary view similar to Fig. 1, showing the mechanical travel 'required to release the interlockof the inclosure from the door;

' Fig.3 is a vertical sectional viewitaken on theline 3-3 of Figurefi, showing'c'er-L tain details of the interlocking mechanismincluding the make and.1break contacts of the elevator cab current supply;

Fig. 4 is a fragmentary ertical sectional view similar to Figure 3, showing: the position 85 swing door is released; i

Fig. 5 is a front elevation of the interlocking mechanism, parts being broken away. to better disclose certain details; of construct Fig. 6 is a horiziontalsectional view'taken substantially on the line 6-6 of Figure 5- and shows the interlocking draw bolt in enr "u95 Fig. 7 is a sectional view similar to Figure 6, showing the draw bolt of the swing; door in released position; 7 o I f Fig. 8 is a sectional viewsimilar toFigure- 7, showing the relative positionof the inter:

'ofcertain of .theinterlock elements when the.

interlocking elements asshown in Figure 7 and is taken on the line 101O of this figure; Fig. 11 is a plan View of the structure mounted upon the elevator cab by which contact is made with the interlocking mechanism, being taken substantially on the line ,1111 indicated in Figure 1;

Fig. 12 is an enlarged horizontal sectional View, taken substantially on the line -1212 of Figure 1, and discloses details of con-,

struction ofthe contacting structure of the interlocking mechanismwith the cab; Fig. 13 is a vertical sectional View taken.

substantially on the line 1313 of Figurefi and shows thecab current supply switch in operating position;

Fig. 14 is a fragmentary vertical sectional view of a modificationof the interlock actuating cam taken on the'line' 1414 of Figure v15;

Fig. 15 is a plan View of the structure shown in Figure14j Figure 16 is a vertical sectional View taken substantially on the line 1616 of Figure l 7; and

in Figure 17 is a schematic wiring diagram of the hoisting motor control circuit.

Referring to the drawings and particularly to Figure 1 thereof, this invention is preferably shown for use upon an elevator entrance inclosure I generally indicated by the reference numeral 10. The inclosure 10 Y forms one of the walls of the elevator shaft "11 in which is located, for purposes of structural illustration, a cab 12. Mounted upon the cab 12 is a solenoid 14, having a movable armature 15 therein. A link 17 is joined bythe pivotal connection 18 to one end of the with sidewalls 22, along one of wh ch bosses- 23 are formed and to which channel support-' ing links 25 are pivotally mounted upon saidbosses; The links 25 are pivotally supported upon the cab 12. It is to be noted that the armature 15, The other end of the link 17 is. pivotally connected at 20 with a channel member 21. The channelmember is formed armature 15, in the position shown in Figure 1 of the drawings, when assisted by the links 17 supports the channel'member 21. l Vhen energy is cut oil from the solenoid 14, the

armature 15, due tothe weight of the chan-' nel member 21 and links 17 and25, moves by gravity to the position shown in Figure 2 of the drawings. The clownwardinovement of the armature and the links25 is limited in any suitable fashion as by the provlsion of astop pin 26 mounted on the cab.

The purpose of the structure mounted upon .the cab 12 is'to facilitate and control lateral movement of the channel member 21 toward or away from the entrance inclosure. When current is supplied to the solenoid 14, the armature is drawn thereinto raising upwardly as well as moving laterally the channel member 21.

Mounted within the inclosure 10 is a boxlike structure 28 which contains the interlocking mechanism. The box 28"is setinto V theinclosure 10 and secured thereto in any The shaft wall 31 of said suitable manner. box has supported thereon the entire interlocking mechanism] The reason for this is to permit the quick removal and'repair or replacement of any of the elements of'theinterlocking mechanism should failure for any reason occur. The wall is in the form of a cover to the box 28 andris secured thereto by bolts or in any other accepted manner. Mounted on'the wall 31 of. the box'28' is a boss 29 having spaced. lugs 30. These lugs are horizontally drilled to permit the passage therethrough of the bolt 32. The interlock operating cam 34 is comprised of ad- I justable telescoping elements 36-;and 37, se cured together by bolts 38. The elementi36 of the cam, adjacent its inner end, isformed with an enlarged portion-39through which.

an opening 40 is drilled and in which akeyway 42 is formed. The portion 39 is mount{ ed against the outer face of one of thelugs. '30 of the boss. Between the lugs 30 and -keyed to the bolt32 is an arm 41. 'This armi extends through aslot in the wall 31 into the boX28 and is directly connected withthe interlocking mechanism. The arm 41, being connected through the bolt 32 to'the cam 34,

transmits any movement of said cam to the operatmg mechanism contained withm the box. The outer end of the element 37, which forms a part of the cam 34, is drilled to permit the'passage therethrough of a bolt 44 upon which is mounted a r0ller'45. The roller 45, being mountedupon the end ofthe cam 34, extends well into theelevator shaft 11 and is in vertical'alignment with the channel member21 when said channel member is'in theposition shown in Figure 1 of the] draw in'gs. When the cab 12' moves upwardly or downwardly past a floor level, from which inclosure the cam 34' projects, the roller 45' passes between the walls 22 of the channel member 21. It will be noted that the ends "of the walls 22Vare slightly flared to assist in centering the roller for free passage through the channel member 21. VV-hen the elevator cab 12 stops'at a floor level, the

roller 45 will lie within the channel member 21 substantially as is showninFigure 1 of the drawings. 7 When :installingthe contact structure on the cab, infinite care as to loca-. tion need not be taken in viewof the fact that the cam34 is telescopically adjustable is directed to Figures 14 and 15 in which is shown a slight modification ofthe interlock operating cam above described. The modified cam 47 is comprised of telescopically engaged elements 48 and 49. Secured to the 10 end of the element 49, by means of a pin 50,

is a roller 51 which corresponds to the roller 45. The element 48 is formedwith flanges which en age the element 49 and suitable bolts 53 join said elements together. Ad-

' 5 jacent its inner end, the element 48 is mounted between plates 55 and 56. These plates are secured to the wall 31 of the box 28 by means of bolts 57. Concentrically disposed horizontalopenings 59 are formed. in the plates 0 1 55 and 56 by means of and between which the element 48 is pivotally secured by a pin 60. The element 48 terminates in an angle portion 62 which extends into the box 28 and is connected with the interlocking mechanism. QWithin the box 28 and secured to the wall '31 of said box is an angle bracket 66, having an opening 67 drilled through its horizontal flange 68. A plate 70 is supported in the opening 67 of the bracket 66. Encircling the plate 70 is-a coiled spring 71,- the upper end of which abuts the lower face of the.

flange 68. The lower end of the spring is supported upon a shoulder 72, securely attached in any suitable manner to the plate 70. Directly beneath the shoulder 72 a slotted opening 74 is formed with which the arm 41 of the operating cam engages. When the cam 34 is moved toward or away from the box 28, the arm 41 causes a vertical reciprocation of the plate 70. Adjacent the lower end of the plate 70, an opening 7 6 is formed. This opening is in theform of a slot arranged at a substantial angle to the longitudinal axis of said plate. plate and prevent all but a vertical reciprocation thereof, a strap 77 incloses the lower' end of said plate. The flanges 78 of said strap are welded or otherwise suitably secured to a second strap 80. The strap 80, by means of flanges 81, is welded 'or otherwise joined to the wall 31 of the box 28.

through a supporting plate 82. The strap 77, supporting the vertical plate 70, is at right angles to the strap 80 which is adapted to support the horizontally movable elements.

Between the strap 80 and the plate 82 is mounted a horizontal guide member 84, the flanges 85 of which are permanently joined to the plate 82. The raised portion 86 of the guide 84 abuts the raised portion of the strap 80. Supported within the guide 84 is a draw bolt engaging element 88, the outer end 89 of which is formed to provide a pocket One of the walls 92, of the pocket 91,

In order to support theterminates in a finger 93,- the purpose of which will later be broughtout. That portion of the element 88 located within the e guide member 84 is'provided with a drilled and tapped opening 95 into which is threaded a bolt 96. Between the enlarged head 97 v and the threaded portion, said'bolt is fitted with a bushing 98. The bushing 98 is of a diameter such that it will freely enter the posed with the slots 99 and 101. The bolt 97 and sleeve 98 lie within the opening76- of the plate 70 and the slots 99, 101 and 102 of the two straps and guide 84. 'It'will be readily understood from the description thus far that as the plate 70 moves upward-.7

ly, the bolt97, mounted within the angularly disposed opening 76, will move 'laterally a, distance governed by the angle at'which the opening 76 is formed. As the bolt 97 moves laterally, the element 88, to which it is,s e-

cured,-is likewise moved.

The'wall or jamb 104 defining the door.-

opening 103 and forming part 'of the i'inclosure 10 is shaped to providea flanged door i stop 105, against Which the door 106 lies when slotted,

closed. A transversely disposed opening 108 is cut into the jamb 104 to permit movement therethrough of a portion of the element 88. The door 106 is fitted with a channularv reinforcing member 109, be-" tween which and the vertical wall 110 of the door, is mounted a draw bolt 112 and attendant structure. A bracket 1113 in the form of a box, in which is mounted the draw,

bolt 112, is formed with a flange .114, by which it is secured to one wall of the door. The other side of the box is doubled back upon itself and welded or otherwise secured to the other wall of said door. In as much as the manner of supporting the draw bolt 112 is of little or no importance and forms a no part of this invention, further description thereof is unnecessary. A transverse slotted opening 116 is formed in the vertical wall 110 of the door directly in line with the opening 108 of the jamb. The purpose of this is to permit the passage of a portion of the draw bolt 112 and the end of the element 88 to move into or out of the adjacent strucf ture. I j o The draw bolt 112 terminates at its outer end in an angular arm 117. The arm 117,

when the door is closed, locked orunlocked,

lies within the pocket 91 of the element 88. As will be understood by referring to Figures 7 and8 of the drawings, the arm 117 of the draw bolt 112 must liewithin the confines of the door 106, in order toopen said door. A

recess 119 is formed in the vertical wall of the and when said bolt is in the position shown in Figure 7, the recess 119 is in line with an opening 120 in the vertical wall of the bracket 113. Mounted upon a supporting plate 122 is a pivot arm 123, joined to said plate by means of 'a pin 124., The inner end of the arm 123 terminates in a finger 126 which is adapted to pass through the opening 120 of the bracket 113 and engage the draw bolt by means of the recess 119. A flange 127 is struclr up from the plate 122 directly to the rear of the 'finger 126 and a coiled spring 128 is mounted between said flange and said finger. The purpose of the spring is to cause the finger 126 to, at all times, engage the draw bolt 112,

7 either along the vertical face thereof or within the recess 119. As may be seen in Figure .8' of the drawing, were it not for the arm 123 engaging thefdraw bolt 112, when the door 106 is opened, said draw bolt could move out of the door and, as the door closed, would strike the enclosure preventing a complete closing and the subsequent locking of said door. The end ofv the arm 123, remote from the finger 126, terminates in a curved'flange 130 which is engaged by theend '89 of the element 88 when the door is closed. The arm 123 therefore is held out of engagement with the draw belt 112 against the tension of the spring 128 by the end 89 of the element 88. When the door is opened, the arm 123 is freed of contact with the end'89 and the of the solenoid cab 12.

spring 128 causes the finger 126, to engage the recess 119 of the draw bolt 112.

Adjacent the jointure of the arm 117 with the body portion of the draw belt 112 and in the vertical face of said arm a recess 132 is formed. Permanently mounted within the recess 132 is a copper or other efficient current carrying contact 133. Vithin the .boX 28 is a'switch 1 35 comprised of an actuating arm 137 formed from a suitable insulating material and of a configuration substantially that shown in Figure 6 of the drawings. The

end ofthe arm 137 is formed with verticallyspaced recesses 138 in which are mounted spaced copper contacts 140. The contacts 140 form an open circuit and the contact 133 of the arm 117 is adapted to close this circuit which is employed to control the operation 14 mounted upon the elevator 144, causing said contact to engage the arm 137 under spring pressure Suitable terminals 152 by'which electrical connection is had with the contacts 146 are formed at the I end of each rod 149. Itmay readily be;

understood that when'the arm 137 is mounted between the head 148 of the contacts146, said contacts will open or close the circuit in which they are locatedas said arm moves in or out by reason of the fact thatthey engage either the insulating material, of which the arm is formed, or the metal insert 142. The circuit, which is opened or closed'by the above described switch structure, controls the power by which the elevator cab is raised'or low-5 cred. -Attention .is directed to the fact that the contacts 146 and metal insert 142 control current supply to. the cab 12 and c0ntacts'140 and 133 control the current supply to the solenoid 14. The source of current supply.

to the cab is the same as that to the solenoid although they are controlled by different in- V .crinediate' switches. It would follow therefore that if the cab power is turned on, it is possible for either the solenoid 14uor the cab to function independently of each'other or. under certainv conditions to function together. The purpose of this switch control will be clearly brought out in the description of the operation of the device.

In assembhng a device of this character,

it has, been found preferable to unite certain groups of elements prior to the final as sembly of the entire mechanism. For this reason, the switch structure 135 is assembled as a unit and, after the'interlocking structure has been mounted upon the wall 31, said switch is installed. The cam 34 and cam support, being also mounted upon the wall 31, are assembled with the interlocking struc-' ture when said wall is secured to the box 28. The cab structure is neXt securedin place, the channel 21 thereof being moved to approximate alignment with the inoperative position. of'the roller 45. When this is done,

any slight misalignment, as between the roller 45 and channel 21, may be overcome by shortening or lengthening the cam 34.

In describing the operation of this invention no particular refrence is made to thevarious controls mounted in the pent house in the top of the shaft nor to any other switch operating structures other than those above described for thereason that these structures are old and well known in the art. For the purpose of illustration, let it be assumed that r the cab 12 has just moved to the floor level indicated in Figure 1 of the drawings. Durin g this. movement current is acting to energiZe thesolenoid as well as operate the cab. As the cab operating power is out off, the

power to the solenoid 14 is likewise cut, thus permitting the armature 15 therein to move outwardly by force ofigravity carrying with itthe channel member 21. The movement of the channel is transmitted to the roller with which it is engaged and causes said.

roller and the cam 34 to move downwardly toward the inclosure 10. Since the cam 34 and arm 41 are keyed together through the shaft 32, said arm, will be raised a distance proportionate to the downward travel of said cam. Because the arm 41 is engaged outer end 89 of the element 88 is engaged with the arm 117 of the-draw bolt 1.12 by means, of the pocket 91. Furthermore, the

finger 93 forming apart of. the end 89 is locate'd to the rear ;of a shoulder formed in the switch arm 137; Consequently, as the element 88 movesoutwardly, the draw bolt 112 will be moved into the door 106, through the slot 116 in said door, and the arm137 will be moved to the position such that the contacts 146,-no longer engage the metal insert 142 but areseparated by a part ofthe insulated arm 137. As theswitch 135 is in the circuit which supplies power to move the cab. 12', breaking of this contact prevents the cab from being moved away from the floor with which it is inregister. Thereason for this is obvious, because, when the draw bolt 1112 has moved into the door 106, saiddoor is unlocked and may be operated'from either side of the elevator shaft. Because no power can be transmitted to move the cab from the floor level, it is safefor the door 106 to be opened or closed as desired.

As brought out in the description of the door 106, it is possible the draw bolt 112, when said door is swung open, might be jarred out of place sutficiently to prevent complete closing of the door. This is prevented by the engagementof the finger 126 under pressure of the spring 128 with the draw bolt; This movement of the pivoted arm 123 occurs only when the door is swung open and by which action the flange 130 is released from contact with the end 89 of the element 88. When the door is again closed, the flange 130 strikes the end 89, causing the finger 126 to move out of engagement with the recess 119 in the draw bolt 112 and said bolt may then be moved into locked position. r

Attention is directed'to the fact that, although the current supply to operate the cab 12 is cut by means of the switch 135, it is also necessary that the current'supplv for the solenoid "14 be cut at substantially the same time. The reason for this is dueto the fact that the switch by whichthe cab is moved may be closed and, although the cab will fail to movedueto the break in its circuit through the switch 135, the solenoid" might operate thus causing the interlocking structure within the inclosure 10 to move to locked position. If it so'happened, that the door 106 was even slightly opened at this time, when it closed later no locking thereof would take place and as the cab moved from the fioor level said door could be opened upon unguarded shaft. In order to-prevent such a contingency, the current supply in the solenoid 14 is carried through the contacts 140 which are spaced apart from-each other 1n the end of the arm 137 of the switch 135.

The end of the draw bolt being fitted with the contact 133 completes or breaks thesolenoid circuit through the contacts 140. There- ,fore, although the cab operatingswitch may be closed, the solenoid 14' cannot be energized unless the door 106 ,is in full and complete engagement with the inclosure 10. When the door 106 is closed'and the solenoid circuit is completed through the contacts 140,: said, solenoid will actuatethe interlocking mechanism to lock the'door and. at the, same time the arm 137 of the switch 135;,wil1 be moved by a pushing action of the end of the draw bolt 112 to a position such. that the metal; insert 142 completes the circuit between the contacts 146 and thus permits the flow of current to operate the cab 12. I 1

It will be noted that when the cab 12 leaves 1,100

the floor with which it-was in register, no

movement or action ofthe interlocking mech-' anism takes place by'reason of thefactthat in order for said cab to be supplied with energy by which to move it'upwardly or downwardly, the interlock must have been oper- .ated to secure the door. During the travel of the cab 12, between floors or during the time that current is supplied to the .cab, the solenoid 14 is energized in order tha-tithe armature 15' mounted therein will retain-the channel member 21in its innermost position I which is in vertical alignment with the; rollers 45 located at the various floors. As the cab comes'in registerwith any floor, the 'so-lenoid current isfcut simultaneously with the cutting of the current "to the'cab and since, whensaid. cab is in register with a given floor, the.roller 45 is within the channel member 21,-said channel member will;

drop under force of gravity, operatingthe cam 34 and releasing the interlock of the door purpose of the spring 71 is merelyto insure the maintenance of the cam 34' and roller 45 in extended inoperative position in order that as the cab 12 moves upwardly or downwardly the channelmember 21 mounted thereon will register withv the roller 45. Should'it be found necessary, additional weight could be supplied to the channel member" 21 by increasing thesize of the support ing links or a small spring could be attached to exert a downward and forward pull upon the channel 21 when energy to'the solenoid 14 is cut off. I 1

The structure shown in Figures 146 and 15, and dealing with a modification of the cam 47 and roller is operated by the identical structure that the cam 34 and roller 45 are operated. However, in this instance the roll- -e=r contacting structure is mounted'on the face of the cab thereby creating a'transverse movement to the channel member 21 and an up and down movement to the cam 47. The angle portion 6-2 of the cam i7 is engaged with the plate 70' in'substantially the same manner as the arm 41 of the cam34.

-Although one modification of the interlocking mechanism has been shown and described and two modifications or adaptations of the contacting structure have been shown,

applicant does not intend to be limited thereto since it is obvious to those skilled in the art that other modifications may be made without departing in any way from the spirit and scope of-this invention as set forth in the hereunto anneXed claims.

Having thus set forth my invention what I claim as new and for which I desire protection by Letters Patent is:

1. In an elevator structure, a locking mechanism for swing door inclosureunits comprising extendible means within the frame of said unit, withdrawable means inthe door of said unit and further means mounted upon a cabpsaid last means being adapted to actuate said withdrawable means through'said extendable means to control opening said door. r

2. In an elevator structure, a locking mech- 'anism'for swing door inclosure units comprising extendalole means within the frame of saidunit, withdrawable means-1n the door of said unit, said withdrawab'le means being normally engaged with said eXtendible means, and means mounted on a-cab adapted to actuate said withdrawablemeans wherebyto control opening said door. a

3. In an elevator structure, a lockingmeehanism for swing door inclosure units com-. prising extendable means within the frame of said unit, means withdrawahle'from in the- V 7' door of said unit, Isaidwithdrawa le means being normally engaged with said extendible means, and c a further cab operated means adapted to actuate said withdrawable means to control opening said door,

4. In an elevator structure, a locking mechamsm for swing door lnclosure units C0111- prising a draw bolt mounted in the door of said unit, means mounted in the frame of said unit normally engaged with said draw bolt and cam means mounted on a cab located within the shaftof saidstructure, said cam means being adapted to actuate said frame means whereby tomove said draw bolt into locked or unlocked position. 1

6. In" an elevator structure, a locking mechanism for swing door inclosure units comprising means automatically actuated by cab control member, means mounted in the frame of said unit,-.further mean-s, mounted.

within the door of said unit normally interengagedwith said frame means, said automatic means being adapted to engage said frame means whereby'to lock or unlock said door. a

7. In an elevator structure," a locking mechanism for swing door inclosure units comprising actuating means automatically controlled by a cab control member, means mounted in said inclosure engageable with said actuating means, further means operatively connected with said inclosure means, a draw boltmounted in the door of said unit 'n'ormally engaged with said further means and adapted to be moved to control the re lease of said door by the operation of said actuating means.

8. In an elevator anism for swing door inclosure'units comprising actuating means mounted upon and automatically controlled'by a cab control means, extendible 'means mounted in the frame of said un t, withdrawable means mounted in the door of said unit, a cam supported upon said inclosure and engaged with said eXtendible means, said cam beingadapte ed to be engaged and operated by said actuat ing meanswhereby to move said withdrawable means to'lock or unlock said door.

9. In an elevator structure, a locking mechanism for swing door inclosure" units comprising actuating means, mounted upon structure, alocking mechand controlled by a cab controlled means, a

draw bolt mounted in the door of said unit a draw bolt operating elementmounted with in the frameiof said unit and normallyinengagement with said .draw bolt, means supported upon said'inclosureunit and linked with: said operating element, said last means being adapted to be engagedandoperated byi 'ture mounted upon said unit and linked with said operating element, said cam being adapted to be engaged and operated by said cab mounted means whereby to move said withdrawable means to release or lock said door. 1

11. In an elevator structure, a locking mechanism for swing door inclosure units comprising means mounted upon a cab located within the shaft of said structure, said means being automatically controlled by the control means of said cab, a draw bolt mounted in the door of said unit, a draw bolt engaging and operating element mounted in the frame of said unit and normally in engagement with said draw bolt, means linked with said operating element, said means being engageable and operable by said cab means, and circuit breaking means in said frame adapted to prevent travel of said cab within said shaft when said door is unlocked.

12.1n an elevator structure, a locking mechanism for swing door inclosure units comprising means mounted upon a cab located within the shaft of said structure, said means being controlled by the control'means of said cab and by said locking mechanism, a draw bolt mounted in the door of said unit, an operating element mounted in the frame of said unit and normally in engagement with said draw bolt, means releasably connecting said operating element with the means on said cab, said cab means being adapted to actuate said operating element and said draw bolt to lock or unlock said door. r

13. In an elevator structure, a locking mechanism for swing' door inclosure units comprising solenoid actuated means mounted on a cab located within the shaft of said structure, said means being actuable by the control means of said cab, a draw bolt in the door of said unit, an operating element in the frame of said unit and normally I in. engagement with said draw bolt, means releasably conmechanism for swing door inclosure units comprising a drawbolt in the door of said unlt, a draw bolt operating element in the frame of said unit and normally in engagement with said draw bolt, a cam mounted on said frame and extending into the shaft of said structure, .saidcam being linked with said operating element, solenoid, actuated means mounted on a cab within the shaft of said structure and adaptedto engage and operate said cam whereby to lock or unlock said door. a p

15. A-locking" mechanism for swing door inclosure units comprising ajdraw bolt inthe door of said u'nit,an operating element in the frame of said'iunitzand normally in engagement with said draw bolt, a cam mountedupon said frame, meansconnecting said cam with said operating element whereby actuation of said cam causes said operating element to-releasably to permit openingsaid'adoor;

ld 'Alocking mechanism for swing 'door inclosure units comprising a draw bolt .in thedoor of said unit,"an operatingjelement in the 'frame of saidfunit, a cam mounted upon said frame, an arm on said cam, means vconnectingsaid arm with said operating element and-means in saiddoor adapted to engageand retain said drawbolt in released positionduring opening or closingof said door.

17 A locking mechanism for swing door lnclosure units comprising a draw bolt'mounted in the door of said unit, an operating element mounted in the frame of said unit, means in said door engaging and retaining said draw bolt in inoperative position when said door is being opened or closed, said means being released by said operating element, a cam mounted on said frame, means connecting said cam with said operating element whereby actuation of said cam permlts or prevents opening said door..

engage said :draw bolt 18. A locking-mechanism forjswing door V inclosure units comprising a draw bolt mount-v ed in'the door of said unit, an operating element mounted in the frame of said unit, a pivoted arm engageable with said draw bolt when said drawbolt is in released position, va cam mounted on the frame of sald unit,

means connecting said cam with saidoperating element whereby when said cam'is actuated said dra'w bolt will be interlocked or releaseably engaged with said operating element to permit or prevent opening said door.

19.- A locking mechanism for swing door inclosure units comprising a draw bolt in the door of said'unit, an operating element in-the frame of said unit, a pivoted arm mounted in said door and engageable with said draw bolt, a cam mounted upon said frame, means con-V necting saidcam with said operating'element and circuit control means in said frame adapted to break an electrical contact when said cam is actuated to cause said operating elcment and said draw bolt to be releasably engaged with each other.

:20. In a locking mechanism for swing door inclosure units, adraw bolt in the door of said unit, an operating element in said inclosure and normally interlocked with said draw belt, a: switch box in said inclosure, an arm projecting'from .said boX, said arm being 7 actuated inone direction by said operating element and in the other by said draw bolt.

21. In a locking mechanism for swing door O inclosure units, a draw bolt in the door of said unit, an operating element in'sa-id inclosure, a switch boxin. said inclosure, an arm projecting from said boX,"-spaced 'elec' trical contacts on .said arm, a contact in said -draw bolt, said I draw bolt contact being adapted, when said door is closed, to en gage said spaced contacts whereby to close the circuit of the locking mechanism actuator.

22. In a locking mechanism for swing door 7 incl-osure units, a draw boltin the door of said unit, an operatingelement in said in- .elosure, a switchbox in said inclosure, means projecting from said box engageable with said operating element and-said draw bolt, said means being adapted to open or close one electric circuit when actuated by said element and open or close a further circuit when engaged or released by said draw bolt.

Intestimony whereof I- have aflixed my signature. i LUDWIG G. JACOBSONV 

